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hotspot/src/cpu/sparc/vm/vm_version_sparc.cpp

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+/*
+ * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_vm_version_sparc.cpp.incl"
+
+int VM_Version::_features = VM_Version::unknown_m;
+const char* VM_Version::_features_str = "";
+
+void VM_Version::initialize() {
+  _features = determine_features();
+  PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
+  PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
+  PrefetchFieldsAhead         = prefetch_fields_ahead();
+
+  // Allocation prefetch settings
+  intx cache_line_size = L1_data_cache_line_size();
+  if( cache_line_size > AllocatePrefetchStepSize )
+    AllocatePrefetchStepSize = cache_line_size;
+  if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
+    AllocatePrefetchLines = 3; // Optimistic value
+  assert( AllocatePrefetchLines > 0, "invalid value");
+  if( AllocatePrefetchLines < 1 ) // set valid value in product VM
+    AllocatePrefetchLines = 1; // Conservative value
+
+  AllocatePrefetchDistance = allocate_prefetch_distance();
+  AllocatePrefetchStyle    = allocate_prefetch_style();
+
+  assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
+
+  UseSSE = 0; // Only on x86 and x64
+
+  _supports_cx8               = has_v9();
+
+  if (is_niagara1()) {
+    // Indirect branch is the same cost as direct
+    if (FLAG_IS_DEFAULT(UseInlineCaches)) {
+      UseInlineCaches         = false;
+    }
+#ifdef COMPILER2
+    // Indirect branch is the same cost as direct
+    if (FLAG_IS_DEFAULT(UseJumpTables)) {
+      UseJumpTables           = true;
+    }
+    // Single-issue, so entry and loop tops are
+    // aligned on a single instruction boundary
+    if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
+      InteriorEntryAlignment  = 4;
+    }
+    if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
+      OptoLoopAlignment       = 4;
+    }
+#endif
+  }
+
+  char buf[512];
+  jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s",
+               (has_v8() ? ", has_v8" : ""),
+               (has_v9() ? ", has_v9" : ""),
+               (has_vis1() ? ", has_vis1" : ""),
+               (has_vis2() ? ", has_vis2" : ""),
+               (is_ultra3() ? ", is_ultra3" : ""),
+               (is_sun4v() ? ", is_sun4v" : ""),
+               (is_niagara1() ? ", is_niagara1" : ""),
+               (!has_hardware_int_muldiv() ? ", no-muldiv" : ""),
+               (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
+
+  // buf is started with ", " or is empty
+  _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
+
+#ifndef PRODUCT
+  if (PrintMiscellaneous && Verbose) {
+    tty->print("Allocation: ");
+    if (AllocatePrefetchStyle <= 0) {
+      tty->print_cr("no prefetching");
+    } else {
+      if (AllocatePrefetchLines > 1) {
+        tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
+      } else {
+        tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
+      }
+    }
+    if (PrefetchCopyIntervalInBytes > 0) {
+      tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
+    }
+    if (PrefetchScanIntervalInBytes > 0) {
+      tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
+    }
+    if (PrefetchFieldsAhead > 0) {
+      tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
+    }
+  }
+#endif // PRODUCT
+}
+
+void VM_Version::print_features() {
+  tty->print_cr("Version:%s", cpu_features());
+}
+
+int VM_Version::determine_features() {
+  if (UseV8InstrsOnly) {
+    NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
+    return generic_v8_m;
+  }
+
+  int features = platform_features(unknown_m); // platform_features() is os_arch specific
+
+  if (features == unknown_m) {
+    features = generic_v9_m;
+    warning("Cannot recognize SPARC version. Default to V9");
+  }
+
+  if (UseNiagaraInstrs) {
+    if (is_niagara1(features)) {
+      // Happy to accomodate...
+    } else {
+      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
+      features = niagara1_m;
+    }
+  } else {
+    if (is_niagara1(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
+      NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
+      features &= ~niagara1_unique_m;
+    } else {
+      // Happy to accomodate...
+    }
+  }
+
+  return features;
+}
+
+static int saved_features = 0;
+
+void VM_Version::allow_all() {
+  saved_features = _features;
+  _features      = all_features_m;
+}
+
+void VM_Version::revert() {
+  _features = saved_features;
+}